Professor: 
Georg Hoffstaetter 

Georg.Hoffstaetter@cornell.edu 

118 Newman lab 
Energy Recovery Linacs are a new kind of linear accelerators. To use such an accelerator
to construct an xray source poses many challenges.
This course will introduce into accelerator physics, emphasizing the aspects
that are most relevant for the design and construction
of an xray source based on this new kind of highenergy electron accelerator. There
will be guest lectures by several important players in Cornell's effort to
build an Energy Recovery Linac.
Dates and draft meeting times  
Mo  01/ 21/ 08, 12:2013:10  132 Rockefeller Hall  First lecture 
We  01/ 23/ 08, 12:1013:20  132 Rockefeller Hall  Second lecture 
Mo  01/ 28/ 08, 12:0013:15  301 Wilson lab  Third lecture 
We  01/ 30/ 08, 11:4513:00  301 Wilson lab  Fourth lecture 
Fr  02/ 01/ 08, 11:4513:00  301 Wilson lab  Fifth lecture 
Mo  02/ 04/ 08, 12:0013:15  301 Wilson lab  Sixth lecture 
Fr  02/ 08/ 08, 11:4513:00  301 Wilson lab  Seventh lecture 
Fr  02/ 15/ 08, 11:4513:00  301 Wilson lab  Eighth lecture 
Mo  02/18/08, 12:0013:15  301 Wilson lab  Lecture 
We  02/20/08, 11:4513:00  301 Wilson lab  Lecture 
Mo  02/25/08, 12:0013:15  301 Wilson lab  Lecture 
We  02/27/08, 11:4513:00  301 Wilson lab  Lecture 
Mo  03/03/08, 12:0013:15  301 Wilson lab  Lecture 
We  03/05/08, 11:4513:00  301 Wilson lab  Lecture 
Mo  03/10/08, 12:0013:15  301 Wilson lab  Lecture 
We  03/12/08, 11:4513:00  301 Wilson lab  Lecture 
Mo  03/24/08, 12:0013:15  301 Wilson lab  Lecture 
Fr  03/28/08, 11:4513:00  301 Wilson lab  Lecture 
Mo  03/31/08, 12:0013:15  301 Wilson lab  Lecture 
We  04/02/08, 11:4513:00  301 Wilson lab  Lecture 
Mo  04/07/08, 12:0013:15  301 Wilson lab  Lecture 
We  04/09/08, 11:4513:00  301 Wilson lab  Lecture 
We  04/16/08, 11:4513:00  301 Wilson lab  Lecture 
Fr  04/18/08, 11:4513:00  301 Wilson lab  Lecture 
Every Mo  after 04/21/08, 12:0013:15  301 Wilson lab  Lecture 
Every We  after 04/23/08, 11:4513:00  301 Wilson lab  Lecture 
Mo and We  03/ 17  03/ 21  No class  Spring break 
We  04/ 30/ 08, 11:4513:00  301 Wilson lab  Last lecture 
Fr  05/ 16/08, 11:30 am  226 Wilson Lab  Deadline for takehome final 
Mo and We  13:0014:00  226 Wilson Lab  Office hours, Prof. Hoffstaetter 
Week of 01/21/08
1) History of Accelerators
 Van de Graaff Accelerator
 CockroftWalton Accelerator
 Marx generator
2) Cyclotrons, Homework 01, Solutions
 Synchrocyclotron
 Isocyclotron
 Edgefocusing
 Alternating gradient focusing
 Betatron
 Wideroe linear accelerator
 Traveling and standing wave acceleration
 Alvarez linear accelerator
 Radio frequency quadrupole
 Microtron
3) Synchrotrons
 Storage rings
 Colliders
Week of 01/28/08
Synchrotron Radiation Sources
 Generations of xray sources
4) Undulator radiation
5) Radiation Power, Homework 02, Solution
6) Bend Radiation
Week of 02/04/08
7) Wigglers and Undulators, Homework 03, Solution
8) FEL amplifiers, Homework 04, Solution
9) FELs, SASE FELs, HGHG FELs
Week of 02/11/08
10) Linear Beam Dynamics, Homework 05, Solution
 Twiss parameters
 Phase space ellipse
 Phase space distribution
Week of 02/25/08
11) Photo Emission Guns, Guest lecture by Bruce Dunham
 High voltage technology
 Laser technology
 DC guns
 RF guns
 SRF guns
12) Space Charge Issues, Guest lecture by Ivan Bazarov
 ChildLangmuir law, Homework 06, Solution
 Emittance measurement
 Busch's theorem
 Paraxial ray equation
 Drift bunching
Week of 03/03/08
13) Twiss parameters
 Invariants of motion
 Propagation of Twiss parameters
 From Twiss to transport matrix, Homework 07, Solution
14) Envelope equation, Guest lecture by Ivan Bazarov
Week of 03/10/08
15) The ERL prototype gun, Guest lecture by Bruce Dunham
Lasers for photoemission guns, Guest lecture by Dimitre Ouzounov
16) Linacs, Homework 08, Solution
 Transport maps and Twiss parameters for cavities
 The normalized emittance
Week of 03/24/08 Guest lectures by Matthias Liepe
17) Accelerating cavities
 Cavity design
18) Higher order mode spectrum
 HOM measurements
 HOM damping
Beam instabilities
 Beam Breakup Instability
 Fast Ion instability
Week of 03/31/08 Guest lectures by Sergey Belomestnykh
19) SRF technology
 Properties of superconductors
20) Cavity preparation techniques
 SRF cryomodules
 Operation of SRF linacs
Week of 04/07/08
20) Hamiltonian motion
 Lioville's theorem
 Invariatn emittance
21) Perturbations to phase space motion
 Orbit Correction
 Dispersion
22) Field Gradient Perturbations
 Optics Measurements and Corrections
Week of 04/14/08
23) Radiative Effects
 Phase Focusing and Synchrotron Oscillations
 Energy Spread Damping by Radiation
 Energy Spread Damping by Stochastic Photon Emission
 The Equilibrium Energy Spread in Rings
 Emittance Reduction by Radiation
 Emittance Increase by Stochastic Photon Emission
 Equilibrium Emittance in Rings
 Emittance Increase by Radiation in an ERL
Week of 04/21/08
24) Longitudinal beam dynamics
 Isochronous beam transport for curvature correction in ERLs
 Bunch compression
25) CSR Effects
 Energy loss from CSR
 CSR wake
 microbunching instability
Week of 04/28/08
26) Nonlinear Optics
 Nonlinear dispersion
27) Nonlinear time of flight
 Energy dependen Twiss parameters
Cornell's ERL prototyping facility
 Cornell's DC photocathode gun
 Cornell's injector linac
 ERL merger test area
The grade will be based on homework and a takehome final. This class will count for 3 credits.
Send comments to G. H. Hoffstaetter
Last Update: 02/26/2008